Re: [whatwg/encoding] Make decode() and encodeInto() accept SharedArrayBuffer-backed views (#172)

C++11/C11 atomic operations are not usable I believe - they assume race-free programs.  This also means they may be optimized in certain ways that runs counter to the JS/wasm memory model.  gcc is quite explicit about this in its documentation, saying that its __atomic intrinsics may not execute fences if gcc thinks they're not required.

(This is getting us into the weeds, probably better handled in email.)


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